Equipment Operation and Maintenance Flashcards by Eric Hurley

The shaft’s main function is to transmit _____ from the motor to the impeller.
a. Centrifugal force
b. Torque
c. Kinetic energy
d. All of the above

b. Torque

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The primary problem with hypochlorinators is that they can clog with _ ____. However, this material can be removed by pumping through the pump, hoses, and diffuser a dilute solution of __ ___.
a. Chloroorganic precipitates, HCL
b. Chloroorganic precipitates, H2SO4
c. Calcium carbonate, HCL
d. Calcium carbonate, H2SO4

c. Calcium carbonate, HCL

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Chlorine gas can kill a person after just a few breaths at concentrations as low as _____.
a. 0.1%
b. 0.2%
c. 0.3%
d. 0.5%

a. 0.1%

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What is the purpose of packing in a pump?
a. Keep oil or graphite on the shaft
b. Control water leakage along the pump’s shaft
c. Reduce friction
d. Prevent wear on the shaft

b. Control water leakage along the pump’s shaft

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What is motor horsepower?
a. The portion of power delivered to a pump that is actually used to lift water
b. The horsepower equivalent to the watts of electric power supplied to a motor
c. The total power input to a motor and pump assembly
d. The power supplied to a pump by a motor

b. The horsepower equivalent to the watts of electric power supplied to a motor

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What is the maximum withdrawal rate for a 1-ton chlorine container to prevent frosting if the backpressure is 35 psig and the container is at room temperature?
a. 400 lb/d
b. 450 lb/d
c. 460 lb/d
d. 500 lb/d

a. 400 lb/d

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What is brake horsepower?
a. The portion of power delivered to a pump that is actually used to lift water
b. The horsepower equivalent to the watts of electric power supplied to a motor
c. The total power input to a motor and pump assembly
d. The power supplied to a pump by a motor

d. The power supplied to a pump by a motor

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The primary reason filters are difficult to clean is because _____.
a. Sticky flock absorbs into the media
b. Sticky floc adsorbs to the media
c. Material collects on top of the media
d. Metal precipitates chemically react with the media

b. Sticky floc adsorbs to the media

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What is the water horsepower?
a. The portion of power delivered to a pump that is actually used to lift water
b. The horsepower equivalent to the watts of electric power supplied to a motor
c. The total power input to a motor and pump assembly
d. The power supplied to a pump by a motor

a. The portion of power delivered to a pump that is actually used to lift water

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In fluoride saturator tanks, the chemical should be at least _ ____ deep at all times, and if the saturator treats more than 100 gpm, it should have a chemical depth of at least _ ____.
a. 4-inch, 6-inch
b. 6-inch, 10-inch
c. 10-inch, 12-inch
d. 12-inch, 18-inch

b. 6-inch, 10-inch

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Chlorine scrubbers are designed to neutralize up to __ ___ of chlorine.
a. 2,000 lb
b. 4,000 lb
c. 6,000 lb
d. 8,000 lb

a. 2,000 lb

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All of the following cause bearing failure, but which one is the major cause of bearing failure?
a. Poor lubrication practices
b. Contamination
c. Vibration
d. Faulty mounting

a. Poor lubrication practices

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In a slow sand filter, once the sand layer is reduced to a depth of _____ new sand should be added to bring the filter bed back to the original depth.
a. 1.0 ft
b. 1.5 ft
c. 2.0 ft
d. 2.5 ft

c. 2.0 ft

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What metal will be anode from the following list because it is the most active?
a. Tin
b. Brass
c. Mild steel
d. Copper

c. Mild steel

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A poor conductor of electricity would be __ ___.
a. Deionized water
b. Lead
c. Acid solutions
d. Zinc

a. Deionized water

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Destruction of pathogenic organisms by chlorine is directly related to _____.
a. Chlorine concentration
b. Chlorine concentration, temperature, and pH
c. Chlorine concentration and contact time
d. Chlorine concentration and pH

c. Chlorine concentration and contact time

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The valves on chlorine cylinders and ton containers must comply with standards set by _ __ __.
a. Chemtrec
b. Chlorine Institute
c. USEPA
d. The particular state’s drinking water regulatory department

b. Chlorine Institute

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Packing replacement is done when __ ___.

a. Water leakage sprays out of the pump housing
b. No further tightening can be done on the packing gland
c. The packing gland bolts are exposed by more than 21/2  inches above the nut
d. Both a and b

d. Both a and b

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Chlorine dioxide is __ ___ in the __ ___ and __ ___.
a. Stable, presence of plastics, low temperatures
b. Stable, absence of light, elevated temperatures
c. Unstable, presence of concrete, corrosion inhibitors containing phosphates
d. Unstable, presence of high alkalinity, corrosion containing phosphates

b. Stable, absence of light, elevated temperatures

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How often should screen equipment be inspected for corrosion?
a. Weekly
b. Monthly
c. Quarterly
d. Annually

b. Monthly

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Surface wash systems for filters agitate the top _____ of the media.
a. 2-inches
b. 4-inches
c. 5-inches
d. 6-inches

a. 2-inches

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What disinfection treatment requires a monitoring procedure, other than residual monitoring, to determine its efficiency?
a. Ozone
b. Ultraviolet
c. Chloramines
d. Chlorine dioxide

b. Ultraviolet

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As water flows through the volute, the pressure head __ ___ and the velocity head __ ___.
a. Increases, increases
b. Decreases, decreases
c. Decreases, increases
d. Increases, decreases

d. Increases, decreases

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The best and most reliable method to find chlorine leaks is a chlorine detector. These detectors can sense leaks as small as _ ____.
a. 1 ppm
b. 2 ppm
c. 3 ppm
d. 5 ppm

a. 1 ppm

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The chlorine gas storage area should provide enough space for a _____. a. 10 – 30 day supply b. 20 – 45 day supply c. 30 – 60 day supply d. 70 – 100 day supply

c. 30 – 60 day supply

A pressure-differential meter is a flow-measuring device that creates and measures a difference in pressure __ ___ to the rate of flow. a. Proportional b. Inversely proportional c. Integral squared d. Differential squared

a. Proportional

Exhaust fan switches for chlorine rooms should be wired to _____ in the room. a. Lights b. Emergency lights c. The chlorine leak detector d. The chlorine alarm system

b. Emergency lights

A bearing is selected according to its _ ____. a. Load b. Speed c. Life expectancy d. All the above

d. All the above

The following procedure is safe for changing out chlorine cylinders or 1-ton containers. a. After removing the brass outlet cap, clean the valve and threads with a wire brush b. Always use a new washer c. Always have a personal protective respirator nearby d. All the above

d. All the above

Patented backwashable pleated membrane filters have been designed specifically for the removal of __ ___. a. Iron b. Carbonates c. Inorganics d. Natural and synthetic organics

a. Iron

Where is the best place to install a vacuum breaker to prevent backflow on a fluoride system? a. Directly above the day-tank b. As close to the chemical feeder as possible c. On the make-up water line d. Between the main storage tank and the day-tank for fluoride

b. As close to the chemical feeder as possible

What is the most difficult and the most expensive physical measurement taken in a water plant? a. Turbidity b. Water flow c. Online total organic carbon analyzer d. Streaming current monitor

b. Water flow

The main purpose of mechanical seals is to _____. a. Keep lubrication in and dirt and other foreign materials out b. Control water leakage c. Keep lubricating grease in the seal d. Hold the packing onto the shaft sleeve

b. Control water leakage

The purpose of a roller bearing is to __ ___. a. Increase torque b. Reduce friction c. Support radial and axial loads d. Both b and c

d. Both b and c

When sodium fluoride solutions are used with hard water, insoluble compounds of __ ___ can form. a. Iron fluoride b. Iron and manganese fluoride c. Calcium and magnesium carbonate d. Calcium and magnesium fluoride

d. Calcium and magnesium fluoride

New packing rings should be staggered at _____. a. 45 ֯ b. 90 ֯ c. 120 ֯ d. 180 ֯

b. 90 ֯

What is the purpose of the graded gravel below the sand in a multimedia filter? a. To support the underdrain system b. To support the sand bed c. To prevent sand from entering the underdrain d. All of the above

d. All of the above

38. Most fluoride dry feeders for large plants should have a vibrator to prevent _____. a. Clogging b. Free flowing c. Bridging d. Saturation

c. Bridging

What disinfection oxidant could have some THM formation? a. Potassium permanganate b. Ozone c. Chloramines d. Chlorine dioxide

c. Chloramines

Open impellers are usually used to pump water that contains ____. a. Large solids b. Any chemicals except acids c. Alkaline chemicals only d. Viscous polymers

a. Large solids

What is the most appropriate chlorine gas solution controller to use if the chlorine demand rarely changes and it is necessary to compensate only for changes in the pumping rate? a. Residual flow control b. Compound loop control c. Flow proportional control d. Direct pressure control

c. Flow proportional control

Equipment’s worst enemy(ies) is (are) _____. a. Overheating b. Dirt and moisture c. Poor maintenance or none at all d. Both b and c

d. Both b and c

Chlorine gas has a pungent, noxious odor and a _____ color. a. Greenish b. Dark green c. Greenish-yellow d. Yellow

c. Greenish-yellow

The purpose of a shaft’s sleeves is to protect the shaft from _____. a. Wear b. Corrosion c. Erosion d. All of the above

d. All of the above

The bearings are protected from water leaking out of the stuffing box by the _____. a. Shaft sleeve b. Lantern ring c. Slinger ring d. Packing gland

c. Slinger ring

What material lines the pipe that carries the corrosive chlorine solution from the injector to the point of application? a. Fiberglass b. PVC c. Stainless steel d. Aluminum

b. PVC

Pumping energy is measured in _____ head. a. Elevation b. Pressure c. Velocity d. All of the above

d. All of the above

Lime should be added to the water being treated _____. a. Using a perforated pipe installed into the water being treated b. Via several small-diameter jet sprays c. With as short of a distance between the feeder and the water as possible d. With nonflexible pipe

c. With as short of a distance between the feeder and the water as possible

What disinfectant oxidant is not at all affected by pH? a. Chlorine dioxide b. Chlorine c. Chloramines d. Ozone

a. Chlorine dioxide

What is the purpose of a chlorinator? a. Prevent blow off of chlorine gas b. Meter the chlorine gas safely and accurately c. Provide an ejector mechanism for the chlorine gas d. Provide a connection between the cylinder, or container to the pipeline for application

b. Meter the chlorine gas safely and accurately

Most pump packing is composed of _ ____ with __ ___ lubrication. a. Asbestos base, graphite b. Flax, Teflon c. Teflon, inert oil d. Aluminum or copper, inert oil

a. Asbestos base, graphite

Most pressure-sensing devices used in water treatment plants rely on _____. a. Hydraulic water pressure b. Hydraulic oil pressure c. The metal-distortion principal d. Mercury

c. The metal-distortion principal

What type of energy is produced when water moves through a pipe? a. Kinetic energy b. Mechanical energy c. Potential energy d. Velocity energy

a. Kinetic energy

Downflow fluoride saturator tanks with a gravel bed should be cleaned at least _____ depending on how fast hardness scale builds up. a. One to three times a year b. Daily c. Every two months d. Every month

a. One to three times a year

What is the major disadvantage of the manual solution feed method using sodium fluoride? a. It is not as accurate as other methods b. The dust generated when added to the day-tank c. Chemical needs to be manually weighted and added to a mixing tank d. All of the above

d. All of the above

What is the break horsepower (bhp) if 60 horsepower (hp) is supplied to a motor with 86% efficiency? a. 45 bhp b. 52 bhp c. 64 bhp d. 70 bhp

b. 52 bhp bhp = (hp) (efficiency)

What is the motor horsepower (mhp), if 80 horsepower (hp = water horsepower or whp) is required to run a pump with a motor efficiency of 91% and a pump efficiency of 82% give answer to 2 significant figures. a. 59.7 mhp b. 60 mhp c. 107 mhp d. 110 mhp

d. 110 mhp mhp = (whp) / (motor eff.) (pump eff.)

Which type of impeller is best to use for pumping water with low volumes of solids? a. Closed b. Open c. Semi-open d. Split

a. Closed

Lubrication has the purpose(s) of _____. a. Removing heat and reducing friction b. Preventing corrosion c. Reducing wear d. Doing all of the above

d. Doing all of the above

What is the only type of pump that can be operated against a closed valve? a. Vertical turbine pump b. Centrifugal pump c. Axial-flow pump d. Mixed-flow pump

b. Centrifugal pump

Equipment Operation and Maintenance Flashcards

(61 cards)